Finale presto

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Finale presto

  1. 1. AE2M32OSS - Optical Systems and Networks Interferometric sensors Mikhail Platonov
  2. 2. Mechanical measurementsElectrical and magneticmeasurementsChemical and biologicalsensing Deformation Monitoring of a concrete bridge deck Pressure and strain sensors
  3. 3. Low coherenceinterferometer based fiberoptic Microphone
  4. 4. Earthquake monitoringof StructuresFOS can evaluate remainingstructures performanceMonitor structuralperformance during an eventDetect inelastic response ofstructural componentsCan be monitored remotelythrough internet
  5. 5. Traffic MonitoringSpeed monitoringWeight sensingTraffic light sensing
  6. 6. Naval Applicationsship structure monitoringOther application areas:- shape monitoring of towedsonar arrays- submersible testing- lock gate monitoring Technology allows any number of sensors to be fitted anywhere in the ship for uninterrupted recordings of actual degree of stress.
  7. 7. Submersible TestingMeasure strain on a deepdiving submersible todepths of1500 ft
  8. 8. Aerospace Applications Mainly dealing with aircraft structure and monitoring of: - Wing shape design analysis - acoustic crack emission - hydrogen sensingMonitoring: loads, rotor/fuselageinteraction, inboard rotor dynamics, hubaerodynamics, airfoil pressure, wake/tailinteractions, fuel tank pressure, structuralintegrity.
  9. 9. Dinner with a scientist
  10. 10. Why fiber optic sensors are so popular?• Harsh environment capability: intensive EMI, high temperature, chemicalcorrosion, high pressure, high voltage• Light weight and small size• Excellent performance: high sensitivity and large bandwidth• Long range operation• Multiplexed or distributed measurements
  11. 11. HistoryArmand Edouard Albert A. KarlHippolyte Stephan Michelson SchwarzschildFizeau
  12. 12. 50ft Interferometer (1931-1938)
  13. 13. Fiber Optic Sensor ClassificationsSensing region: Intrinsic vs. Extrinsic- Intrinsic fiber optic sensor has a sensing region within the fiber andlight never goes out of the fiber.- In extrinsic sensors, light has to leave the fiber and reach thesensing region outside and then comes back to the fiber. Optical modulation mechanism
  14. 14. Intensity Modulated Fiber Optic SensorsBasic structuresReflection type Transmission type Differential intensity sensors Intensity based force sensor
  15. 15. Phase Modulated Fiber Optic SensorsTwo beam interferomenters Michelson interferometer Mach-Zehnder interferometerMulti-beam interferometer Fabry-Perot interferometer Ring interferometer Properties: high sensitivity compared to intensity based sensors
  16. 16. Wavelength Modulated Fiber Optic SensorsFiber Bragg Grating Developed in 1978 by Canadian researchers Hill Λ= pitch of the grating (period length) A periodic change of the refractive index in the core region of an optical Bragg grating sensors for strain and temperature measurements
  17. 17. Wavelength Modulated Fiber Optic Sensors Application areas Civil ApplicationsCivil infrastructure Monitoring bridge structuresAircraft/space Traffic flow/weight monitoringOil/gas Cure of concretePipeline monitoring Dam monitoringElectric power and transport Earthquake monitoringDamage assessment systems Geotechnical Application Corrosion of structures, wind sensing Health monitoring
  18. 18. Future TrendsNew waveguidesNew sensing mechanisms and sensor configurationNew fabrication technologiesHigh density fiber optic sensor networks

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